Dose setting sound structure, torsion spring auto-injector and ratchet

Abstract

The utility model discloses a dose sets up the structure of making a sound, torsional spring automatic injector and jump tooth, this dose sets up the structure of making a sound including clutch tooth, jump tooth and knob, the upper end surface of clutch tooth is equipped with clutch ratchet ring, jump tooth is located the top of clutch tooth, and jump tooth is equipped with in the inside of knob, jump tooth with first component and second component who are respectively equipped with mutually cooperate on the knob, be equipped with elastic arm on jump tooth, the lower extreme of elastic arm is equipped with the jump ratchet that is engaged with clutch ratchet ring, the lateral wall of knob is equipped with still adjusting boss, adjusting boss is placed the below of elastic arm, adjusting boss can prop up elastic arm. The present scheme is simple and compact, and the cooperation degree is good, can greatly reduce the appearance volume of syringe product, and production and assembly are convenient, and the weight is light, and the use hand feeling is good.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a dosage adjustment sound-generating structure, an automatic injector, and a jumping tooth structure. Background Technology

[0002] Automated injectors have reduced the difficulty of administering injections and decreased patient pain, making them popular with many healthcare professionals and patients. Automated injectors all include a accumulator; by releasing the energy in the accumulator, they help the user inject a pre-set dose of medication.

[0003] A known coiled pen syringe employing a torsion spring can be found in patent document CN103249441B. This design includes a housing for containing a syringe or cartridge containing medication; a rotary drive shaft for rotating an adjustable predetermined amount to expel a corresponding amount of medication from the syringe or cartridge; and a torsion drive spring fixed at one end relative to the drive shaft and at the other end to a connector adapted to non-rotatably engage a base on the housing. However, this design is problematic when adjusting the injection dose; if the user sets a dose greater than intended, reducing the set dose is difficult. Furthermore, many syringes do not provide an audible alert when adjusting the injection dose, making the product less user-friendly.

[0004] Patent CN105682711B discloses a pen-type drug injection device, comprising: a housing; a dose selection member; a torsion spring fixed between the housing and the selection member, such that energy is stored in the torsion spring when the selection member rotates relative to the housing; a drive member engaging a lead screw; a first clutch that, in an engaged state, connects the drive member and the housing in a directional direction, and in an unengaged state, allows relative rotation between the drive member and the housing; and a second clutch that, in an engaged state, connects the drive member and the selection member in a directional direction, and in an unengaged state, allows relative clockwise and counterclockwise rotation between the drive member and the selection member. The second clutch includes a toothed ratchet click generator, the teeth having different tilt angles in the clockwise and counterclockwise directions, allowing the teeth to pass over each other in the unengaged state of the second clutch, and providing different resistance in the clockwise and counterclockwise directions, allowing the user to set and correct the dose by tightening or loosening the torsion spring. This design provides a drive mechanism that allows for easy reduction of the set dosage. However, the dosage button is axially constrained to the clutch disc via a latching connection. The clutch disc engages with the selector lever via a spline, and the drive component engages with the inner housing via a spline. A return spring is required to maintain the engagement of the ratchet feature between the drive component and the clutch disc. This return spring applies pressure to the clutch disc, requiring significant force to adjust its rotation and affecting the feel of the operation. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the existing technology described above. One purpose is to provide a torsion spring automatic injector with a dosage adjustment and sound generation structure that allows for free and smooth adjustment of the injection dosage, and another purpose is to provide a simple jumping tooth structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a dosage adjustment sound-emitting structure, including a clutch tooth, a ratchet tooth, and a knob. The ratchet tooth is a one-way ratchet as described above. The ratchet tooth is located above the clutch tooth and is sleeved inside the knob. The ratchet tooth and the knob are respectively provided with a first component and a second component that cooperate with each other. The ratchet tooth is also provided with a spring arm. The lower end of the spring arm extends out of the lower end face of the ratchet tooth and is provided with the ratchet ratchet tooth. The upper end face of the engagement tooth is provided with a clutch ratchet ring that engages with the ratchet. The side wall of the knob is also provided with an adjustment protrusion, which is located below the spring arm. When the knob is turned clockwise, the first component and the second component cooperate with each other so that the knob and the ratchet can rotate synchronously, and the ratchet slides on the clutch ratchet ring to adjust the dosage. When the knob is turned counterclockwise, the adjustment protrusion engages the spring arm, causing the ratchet to separate from the clutch ratchet ring, so that the ratchet can rotate freely in reverse.

[0007] Furthermore, the first component may be a slot or block or other structure with a contact surface disposed on the jumping tooth, and the second component may be a block or slot or other structure with a contact surface disposed on the knob and cooperating with the jumping tooth. The principle is that the first component and the second component contact each other to form a connection, so as to achieve the purpose of transmitting rotational torque.

[0008] Furthermore, both the jumping ratchet and the clutch ratchet ring have a beveled front surface and a vertical back surface. When the jumping ratchet and the clutch ratchet ring are fully engaged, the vertical back surface prevents the jumping ratchet from rotating freely. When the knob rotates forward, the first and second components cooperate, and the knob and the jumping ratchet rotate synchronously. During the forward rotation, the jumping ratchet slides on the clutch ratchet ring. Due to the elastic force of the spring arm, after the jumping ratchet finishes engaging one clutch ratchet ring tooth block, it falls into another tooth groove. This process repeats, and the continuous engagement of the jumping ratchet and the clutch ratchet ring causes the jumping ratchet to jump continuously between the tooth tip and tooth groove of the clutch ratchet ring. The engagement and collision of the jumping ratchet with the end face of the clutch ratchet ring produces a loud "click-click" forward rotation reminder sound. During forward rotation, the jumping ratchet drives the injection component connected to it to rotate synchronously and accumulate energy. When the knob is reversed, the ratchet and the clutch ratchet ring initially remain engaged. Since the rotating block can rotate a certain angle in the rotating slot, the adjusting protrusion pushes the spring arm upward during the reversal process. When the knob is reversed a certain angle, the lower end of the spring arm is lifted by the adjusting protrusion, causing the ratchet and the clutch ratchet ring to separate. The clutch ratchet ring's ability to block the reversal of the ratchet is rendered ineffective. Thus, the ratchet can freely reverse due to the energy accumulated in the injection component it is connected to. During the reversal process, due to the elasticity of the spring arm, the ratchet and the clutch ratchet ring re-engage. This reversal process is repeated, and the collision between the end faces of the ratchet and the clutch ratchet ring will also produce a loud "click-click" reversal reminder sound. During the reversal, the injection component reduces energy, causing the ratchet to reverse synchronously, and the set dose value decreases at the same time.

[0009] Furthermore, the clutch tooth is provided with a first positioning block and a second positioning block. The first positioning block adopts an axially arranged protruding rib. Radial positioning parts that restrict the radial rotation of the clutch tooth are provided on the left and right sides of the first positioning block. A first axial positioning part that restricts the axial movement of the clutch tooth is provided at the bottom of the first positioning block. The second positioning block adopts an elastic protrusion. An inclined mounting part is provided at the bottom of the second positioning block. A second axial positioning part that restricts the axial movement of the clutch tooth is provided on the upper end surface of the second positioning block. This facilitates the installation of the clutch tooth onto the pen body of the syringe.

[0010] Furthermore, the jumping tooth and the knob are respectively provided with a rotating slot and a rotating block that cooperate with each other. The lower end face of the jumping tooth corresponding to the rotating slot is inclined, and the upper end face of the rotating block is also inclined, which makes it convenient to fit the jumping tooth down into the knob.

[0011] Furthermore, the outer side of the knob is provided with several raised and recessed patterns for easy turning.

[0012] Furthermore, the jumping teeth are provided with a connecting ratchet or a connecting keyway to connect the injection component.

[0013] Furthermore, the upper end face of the adjusting protrusion is arc-shaped to match the lower end face of the spring arm, so that the engagement between the clutch teeth, the jumping teeth and the knob is tighter, the movement between the structures is smoother, and the user experience is improved.

[0014] This solution also discloses a torsion spring automatic injector, including a pen body, on which a medicine bottle, an injection component, and the aforementioned dosage adjustment and sound-emitting structure are mounted; the injection component includes a release button, a clutch cylinder, a small push rod, a release spring, a torsion spring, and a push rod drive component; the clutch teeth are fixedly mounted on the upper end of the pen body; the knob is rotatably mounted on the upper end of the pen body; the release button is mounted on the upper end of the clutch cylinder; the release spring is disposed inside the knob; the two ends of the release spring respectively abut against and connect the release button and the pen body; the release spring causes the clutch cylinder... The clutch cylinder is positioned at the axial position of the first clutch cylinder. During dosage setting, the clutch cylinder is positioned at the axial position of the first clutch cylinder. The upper end of the clutch cylinder is connected to the jumping tooth and can rotate synchronously with the jumping tooth and the torsion spring. Pressing the release button can push the clutch cylinder to be positioned at the axial position of the second clutch cylinder. The upper end of the clutch cylinder separates from the jumping tooth and releases the torsion spring to drive the clutch cylinder to rotate. When the clutch cylinder rotates, it drives the small push rod to rotate. The push rod drive converts the rotational torque of the small push rod into axial thrust, thereby pushing out the squeezing vial to inject the medicine.

[0015] Furthermore, the lower end of the release button is provided with a guide rod, which extends into the upper end of the clutch cylinder. The release button is mounted on the upper end of the clutch cylinder, allowing it to move up and down via the guide rod. The upper end of the release button extends beyond the upper end of the knob for easy pressing. A locking buckle is provided between the guide rod and the clutch cylinder to engage with each other. When the clutch cylinder is positioned in the first axial position, the locking buckle between the guide rod and the clutch cylinder is in contact with each other. A release gap is provided between the lower end face of the release button and the upper end face of the clutch cylinder. Pressing the release button downwards causes it to move downwards along the guide rod, separating the locking buckle between the guide rod and the clutch cylinder. After the lower end face of the release button contacts the upper end face of the clutch cylinder, it can push the clutch cylinder to be positioned in the second axial position. Releasing the release button causes the release spring to push the release button upwards. After the locking buckle between the guide rod and the clutch cylinder engages with each other, it will cause the clutch cylinder to return to its original axial position in the first axial position.

[0016] Furthermore, the dosage setting component also includes a graduated cylinder, the inner wall of which is slidably connected vertically to the outer wall of the clutch cylinder, and the outer wall of the graduated cylinder is helically slidably connected to the inner wall of the pen body; wherein, the inner wall of the graduated cylinder and the outer wall of the clutch cylinder are provided with a plurality of mutually cooperating guide rails and sliders, the guide rails and sliders being evenly distributed circumferentially on the inner wall of the graduated cylinder and the outer wall of the clutch cylinder. The upper and lower ends of the outer wall of the clutch cylinder are respectively provided with a zero-position limiting rib and a termination limiting rib that cooperate with the graduated cylinder.

[0017] Furthermore, considering that some medicine bottles contain large doses that can be injected multiple times, the injection component of this design also includes a large push rod. The push rod driver is installed inside the pen body. The side wall of the push rod driver has a positioning block or positioning groove that engages with the pen body to prevent rotation and facilitates installation. The push rod driver has a first driving ratchet. The lower end of the large push rod has a first driving ratchet tooth that engages with the first driving ratchet. The small push rod has an external driving thread, and the push rod driver has an internal driving thread that engages with the small push rod. The push rod driver and the small push rod are threaded together. The lower end of the small push rod passes through the large push rod and the push rod driver and is connected to a handle and a rubber stopper for easy squeezing of the medicine bottle. The large push rod has a groove that engages with the small push rod, and the large push rod has a second driving ratchet tooth. The lower end of the clutch cylinder is equipped with a second drive ratchet. When setting the dosage, the clutch cylinder is positioned in the axial position of the first clutch cylinder. There is a gap of about 0.2mm between the lower end of the clutch cylinder and the large push rod. The second drive ratchet and the second drive ratchet are not engaged. At this time, when the knob rotates forward and backward, the forward and reverse rotation of the clutch cylinder is independent. The torsion spring can accumulate energy along with the forward rotation of the clutch cylinder. During injection, the clutch cylinder is positioned in the axial position of the second clutch cylinder. The lower end of the clutch cylinder is connected to the large push rod. The second drive ratchet and the second drive ratchet are engaged. The stored energy of the torsion spring is released, causing the clutch cylinder to rotate counterclockwise. The clutch cylinder is now connected to the large push rod, causing the large push rod to rotate counterclockwise. The rib groove in the large push rod causes the small push rod to move counterclockwise spiral downward, transmitting the force to the push handle and pushing the rubber stopper downward for injection. After injection, the clutch cylinder returns to its original axial position and separates from the large push rod. This process repeats until the small push rod reaches its end and injection is no longer possible, completing the injection of the entire vial. The large push rod has a flexible ratchet arm at its lower end. The first drive ratchet tooth is located on the outer end face of the flexible ratchet arm. The first drive ratchet tooth has a stop surface that allows the large push rod to rotate only in one direction (counterclockwise) relative to the push rod drive component. Thus, when the first drive ratchet and the first drive ratchet tooth mesh and rotate, the flexible ratchet arm continuously bounces on the ratchet surface, producing a "click-click" injection alert sound.

[0018] Furthermore, the injection component also includes a memory element. The inner wall of the memory element is threadedly connected to the small push rod, and the outer wall of the memory element is slidably connected to the inner wall of the clutch cylinder. The inner wall of the clutch cylinder is provided with a slide rail that mates with the memory element. The memory element is movably mounted on the small push rod. The lower end face of the memory element is provided with an assembly part that fits against the large push rod, and the top of the small push rod is provided with a stop part that mates with the upper end face of the memory element. When setting the dosage, the clutch cylinder is positioned at the axial position of the first clutch cylinder, and the lower end face of the memory element is in contact with the large push rod. The knob drives the jumping gear and the clutch cylinder to rotate clockwise, and the clutch cylinder drives the memory element to spiral upward along the small push rod. During the injection process, the torsion spring stores energy, and the clutch cylinder and the large push rod are not engaged. Turn the knob clockwise to the desired mark. When injecting, press down on the top cap to release the torsion spring. During the downward press, the clutch cylinder engages with the large push rod. After engagement, the clutch cylinder disengages from the jumping tooth, releasing the energy stored in the torsion spring. When the torsion spring returns to its original position, it drives the large push rod to rotate counterclockwise. The large push rod drives the small push rod to spiral downward, pushing the plunger to inject. This causes the memory element to return to its original position on the large push rod. A "click" sound indicates that the injection is complete when the memory element contacts the large push rod. This process repeats until the small push rod reaches the end and locks against the memory element, preventing further injection. This completes the injection of the entire vial of medicine, at which point the knob can no longer be turned.

[0019] Furthermore, the pen body includes an upper pen body and a lower pen body connected to each other. The lower pen body includes a refill holder and a pen cap. A cartridge medicine bottle is installed inside the refill holder. The upper end of the refill holder is snapped or threadedly connected to the upper pen body. The pen cap is detachably fitted onto the refill holder. The pen cap is also equipped with a pen clip for easy carrying.

[0020] This solution also discloses a ratchet, a one-way ratchet, which includes a tooth body with a spring arm on the tooth body. The spring arm is inclined downwards, and the lower end of the spring arm has a ratchet tooth. This one-way ratchet, with its inclined downwards spring arm and ratchet tooth structure, is very convenient in production, assembly, and application.

[0021] Furthermore, the upper and lower ends of the spring arm are connected to the tooth body and the ratchet with an arc-shaped transition, so that the connection of the spring arm is not prone to excessive stress and breakage, and has good fatigue resistance and service life.

[0022] Compared with existing technologies, the advantages of this invention are as follows: The dosage adjustment sound-emitting structure and the matching torsion spring automatic injector designed in this invention are compact in structure. The ratchet teeth and knob are locked together, and the fit between the ratchet teeth and clutch teeth is small. The compact structure and good fit can greatly reduce the size of the injector product. Moreover, the knob, clutch teeth, and ratchet teeth can all be made of plastic, which is convenient for production and assembly, and lightweight. The clutch teeth and ratchet teeth adopt an axially arranged ratchet engagement, and the elastic force of the elastic arm itself is used to maintain the engagement of the ratchet teeth and the clutch tooth ring. The force required to turn the knob to adjust the dosage is smaller, improving the user's feel. The ratchet teeth in this design adopt an inclined downward-facing elastic arm and ratchet tooth structure, which is very convenient for production, assembly, and application. Attached Figure Description

[0023] Figure 1 This is an exploded view of a dosage adjustment and sound-generating structure according to the present invention. Figure 2 This is a cross-sectional schematic diagram of the assembly structure of a dosage adjustment and sound generation structure according to the present invention; Figure 3 This is a schematic diagram of the assembly structure of the knob and the tapping tooth of this utility model; Figure 4 and Figure 5 These are schematic diagrams of the knob and the jumping tooth of this utility model; Figure 6 This is a cross-sectional view of the structure and assembly of the torsion spring automatic injector of this utility model. Figure 7 This is an assembly drawing of the small push rod structure of this utility model; Figure 8 This is a cross-sectional view of the upper pen body structure of this utility model; Figure 9 This is an assembly drawing of the push rod drive component of this utility model; Figure 10-12 These are schematic diagrams of the push rod drive component, memory component, and large push rod structure of this utility model. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following specific embodiments are only representative specific embodiments of the present invention, and the specific methods, devices, conditions, materials, etc., exemplified are not intended to limit the present invention or the corresponding specific embodiments.

[0025] In addition, the terms "lower," "lower end," and "lower part" in the text refer to the end towards the injection needle, while "upper," "upper end," and "upper part" refer to the opposite direction, that is, the end towards the release button.

[0026] A dosage-adjustable sound-generating structure, such as Figures 1-5 As shown, the device includes a knob 31, a clutch tooth 32, and a ratchet tooth 33, wherein the ratchet tooth 33 adopts a one-way ratchet structure as described above. The upper end face of the clutch tooth 32 is provided with a clutch ratchet ring 321. The ratchet tooth 33 is located above the clutch tooth 32 and is sleeved inside the knob 31. The ratchet tooth 33 and the knob 31 are respectively provided with a first component and a second component that cooperate with each other. The first component can be a groove or block or other structure with a contact surface on the ratchet tooth 33. The second component can be a block or groove or other structure with a contact surface on the knob 31 that cooperates with the ratchet tooth 33. The principle is that the first component and the second component contact each other to form a connection, thereby achieving the purpose of transmitting rotational torque. In this embodiment, the rotating tooth 33 and the knob 31 are respectively provided with a rotating groove 332 and a rotating block 312 that cooperate with each other. The rotating groove 332 has a forward stop and a reverse stop at its two ends. The rotating tooth 33 is provided with a spring arm 333, the lower end of which extends out of the lower end face of the rotating tooth 33. The lower end of the spring arm 333 is provided with a ratchet 331, which can engage with the clutch ratchet ring 321. The side wall of the knob 31 is also provided with an adjustment mechanism. The adjusting protrusion 313 is located below the spring arm 333. When the knob 31 rotates forward, the forward rotation stop blocks the rotating block 312, allowing the knob 31 and the ratchet 33 to rotate synchronously. The ratchet 331 slides on the clutch ratchet ring 321. When the knob 31 rotates in reverse, the adjusting protrusion 313 engages the spring arm 33, and the lower end of the spring arm 33 is lifted by the adjusting protrusion 313. The ratchet 331 separates from the clutch ratchet ring 321, allowing the ratchet 33 to rotate freely in reverse.

[0027] Furthermore, both the ratchet 331 and the clutch ratchet ring 321 have a beveled front surface and a vertical back surface. When the ratchet 331 and the clutch ratchet ring 321 are fully engaged, the vertical back surface prevents the ratchet from rotating freely in reverse. When the knob 31 rotates forward, the forward rotation stop blocks the rotating block 312, and the knob 31 and the ratchet 331 rotate synchronously. During forward rotation, due to the elastic force of the spring arm 333, the ratchet 331 slides on the clutch ratchet ring 321. The arm is elastic. After the jumping ratchet 331 finishes engaging one tooth block of the clutch ratchet ring 321, it will fall into another tooth groove. This process is repeated. The jumping ratchet 331 and the clutch ratchet ring 321 continuously engage, causing the jumping ratchet 331 to continuously jump between the tooth tip and tooth groove of the clutch ratchet ring 321. The engagement and collision of the jumping ratchet 331 and the end face of the clutch ratchet ring 321 will produce a loud "click-click" forward rotation reminder sound. During forward rotation, the jumping ratchet 331 will drive the injection component connected to it to rotate synchronously forward to accumulate energy and set the dosage. When the knob 31 reverses, the ratchet 331 and the clutch ratchet ring 321 initially remain engaged. Since the rotating block 312 can rotate a certain angle in the rotating slot 332, during the reversal process, the adjusting protrusion 313 pushes the spring arm 333 upwards. When the knob 31 reverses a certain angle, the lower end of the spring arm 33 is lifted by the adjusting protrusion 313, causing the ratchet 331 to separate from the clutch ratchet ring 321. There is sufficient space between the reversing stop and the forward stop to allow the rotating block 312 to fully reverse, enabling the adjusting protrusion 313 to lift the spring arm 333, achieving the effect of separating the ratchet from the clutch ratchet. The clutch ratchet ring 321 loses its ability to block the reversing surface of the jumping ratchet 331. Thus, the jumping tooth 33 can freely reverse due to the energy accumulated in the injection component it is connected to. During the reversal process, due to the elasticity of the spring arm, the jumping ratchet 331 and the clutch ratchet ring 321 are fully engaged after each tooth is reversed. If the knob 31 continues to reverse, the adjusting protrusion 313 will continue to push open the spring arm 333. During the repeated reversal process, the collision between the end face of the jumping ratchet 331 and the clutch ratchet ring 321 will also produce a loud "click-click" reversal reminder sound. During the reversal, the injection component reduces energy and drives the jumping tooth to reverse synchronously.

[0028] Furthermore, the clutch tooth 32 is provided with a plurality of first positioning blocks 322 and a plurality of second positioning blocks 323. The first positioning block 322 adopts an axially arranged protruding rib. The left and right sides of the first positioning block 322 are provided with radial positioning parts that restrict the radial rotation of the clutch tooth. The bottom of the first positioning block 322 is provided with a first axial positioning part that restricts the axial movement of the clutch tooth. The second positioning block 323 adopts an elastic protrusion. The bottom of the second positioning block 323 is provided with an inclined mounting part. The upper end surface of the second positioning block 323 is provided with a second axial positioning part that restricts the axial movement of the clutch tooth 32. This facilitates the installation of the clutch tooth onto the pen body of the syringe.

[0029] Furthermore, the lower end face of the jumping tooth 33 corresponding to the rotating slot 332 is inclined, and the upper end face of the rotating block 312 is also inclined, which makes it convenient to fit the jumping tooth 33 down into the knob 31.

[0030] Furthermore, the outer side of the knob 31 is provided with several raised and recessed textures 311 for easy turning.

[0031] Furthermore, the spring arm 333 is inclined downwards, and the connection between the upper and lower ends of the spring arm 333 and the jumping tooth 333 and the jumping ratchet tooth 331 is set with an arc transition. In this way, the connection of the spring arm 33 is not prone to excessive stress and breakage, and has good fatigue resistance and service life.

[0032] Furthermore, the jumping tooth 33 is provided with a connecting ratchet 334 or a connecting keyway to connect the injection component.

[0033] Furthermore, the upper end face of the adjusting protrusion 313 is arranged in an arc shape to match the lower end face of the spring arm 333, so that the engagement between the clutch tooth 32, the jumping tooth 33 and the knob 31 is tighter, the movement between the structures is smoother, and the user experience is improved.

[0034] The dosage adjustment sound-emitting structure of this embodiment is lightweight and compact. The ratchet tooth 33 and the knob 31 are locked together, and the fit between the ratchet tooth 33 and the clutch tooth 32 is small. This compact structure provides a good fit and can significantly reduce the size of the syringe product. Furthermore, the knob 31, clutch tooth 32, and ratchet tooth 33 can all be made of plastic, making production and assembly convenient. The clutch tooth 33 and the ratchet tooth 44 are engaged by a ratchet mechanism arranged vertically in the axial direction, and the elasticity of the elastic arm itself is used to maintain the engagement of the ratchet tooth and the clutch tooth ring. The force required to turn the knob 31 to adjust the dosage is small, providing a good user experience.

[0035] This embodiment also discloses a torsion spring automatic injector that utilizes the above-mentioned dosage adjustment and sound-generating structure, such as... Figures 6 to 12As shown, the pen includes a pen body composed of an upper pen body 11 and a lower pen body connected to each other. The lower pen body includes a cartridge holder 12 and a pen cap. A cartridge medicine bottle is installed inside the cartridge holder 12. The upper end of the cartridge holder 12 is snapped or threadedly connected to the upper pen body 11. The lower end of the cartridge holder 12 has a connecting thread for connecting an injection needle. The pen cap is detachably fitted onto the cartridge holder 12. The cartridge holder 12 and the pen cap can be positioned by mutually cooperating elastic buckles. The upper pen body 11 is equipped with an injection component and a dosage setting component.

[0036] The injection component includes a release button 21, a clutch cylinder 22, a small push rod 23, a torsion spring 24, a push rod drive component 25, a release spring 26, a large push rod 27, and a memory component 28. The dosage setting component includes a knob 31, a clutch tooth 32, and a ratchet tooth 33. The knob 31 is rotatably mounted on the upper end of the upper pen body 11. The clutch tooth 32 is locked in the upper pen body 11 and cannot be rotated. The ratchet tooth 33 is locked inside the knob 31. The upper end face of the clutch tooth 32 is provided with a clutch ratchet ring 321. The ratchet tooth 33 is provided with a spring arm 333. The lower end of the spring arm 333 extends out of the lower end face of the ratchet tooth 33, and the lower end of the spring arm 333 is provided with a ratchet tooth 331 that meshes with the clutch ratchet ring 321. The upper end of the clutch cylinder 22 passes through the clutch tooth 32 and the jumping tooth 33. The upper end of the clutch cylinder 22 is connected to the jumping tooth 33 by a ratchet (or a key connection in other embodiments) to achieve synchronous rotation. The clutch cylinder 22 and the jumping tooth 33 can move axially up and down to achieve separation. The lower end of the release button 21 is provided with a guide rod 211, which extends into the upper end of the clutch cylinder 22. The release button 21 is mounted on the upper end of the clutch cylinder 22 through the guide rod 211 and can move up and down. The upper end of the release button 21 extends out of the upper end of the knob 31 for easy pressing. The guide rod 211 and the clutch cylinder 22 are provided with mutually cooperating anti-disengagement buckles. The release spring 26 is disposed within the knob 31. Both ends of the release spring 26 abut against the release button 21 and the clutch tooth 32 (which can also be the knob 31 or the pen body). The release spring 31 provides spring force to maintain the clutch cylinder 22 in the axial position of the first clutch cylinder. The push rod drive 25 is installed inside the lower end of the upper pen body 11. The side wall of the push rod drive 25 is provided with a positioning block or positioning groove 251 that engages with the upper pen body 11 to prevent rotation of the push rod drive 25 and facilitates installation. The push rod drive component 25 has a groove in the middle, and a first drive ratchet 252 is provided on the inner wall of the groove. The lower end of the large push rod 27 rests on the end face of the groove. The lower end of the large push rod 27 has a first drive ratchet 271 that engages with the first drive ratchet 252 on its side wall. The small push rod 23 has an external drive thread, and the push rod drive component 25 has an internal drive thread that engages with the small push rod 23. The push rod drive component 25 and the small push rod 23 are threadedly connected. The lower end of the small push rod 23 passes through the large push rod 27 and the push rod drive component 25 and is connected to a push handle and a rubber stopper for easy squeezing of the medicine bottle. The large push rod 27 has a rib groove 272 that engages with the small push rod 23. The large push rod 27 also has a second drive ratchet 273. The lower end of the clutch cylinder 22 has a second drive ratchet 221 that engages with the second drive ratchet 273.The inner wall of the memory element 28 is threadedly connected to the small push rod 23, and the outer wall of the memory element 28 is slidably connected to the inner wall of the clutch cylinder 22. The outer wall of the memory element 28 is provided with a slider rib 281, and the inner wall of the clutch cylinder 22 is provided with a slide rail that matches the slider rib 281. The memory element 28 is mounted on the small push rod 23 and can move up and down. The lower end face of the memory element 28 is provided with an assembly part that fits the large push rod 27, and the top of the small push rod 23 is provided with a stop part that matches the upper end face of the memory element 28.

[0037] During dosage setting, the clutch cylinder 22 is positioned at the axial position of the first clutch cylinder. The anti-disengagement buckle between the guide rod 211 and the clutch cylinder 22 is in contact with each other. A release gap is provided between the lower end face of the release button 21 and the upper end face of the clutch cylinder 22. There is a gap of about 0.2mm between the lower end of the clutch cylinder 22 and the large push rod 27. The second drive ratchet 221 and the second drive ratchet 273 are not engaged. At this time, when the knob 31 rotates forward and backward, the forward and reverse rotation of the clutch cylinder 22 is independent. The torsion spring can accumulate energy along with the forward rotation of the clutch cylinder 22. At this time, the lower end face of the memory element 28 is in contact with the upper end face of the large push rod 27. When the knob 31 rotates forward via the rotating block 312, the ratchet 331 slides on the clutch ratchet ring 321. The upper end of the clutch cylinder 22 is connected to the ratchet 33 and can rotate synchronously with the ratchet 33 and the torsion spring 24. The clutch cylinder 22 drives the memory element 28 to move upward along the small push rod 23. During this process, the torsion spring 24 accumulates energy. When the desired dosage is reached, the knob stops rotating, and the ratchet 331 is fully engaged with the clutch ratchet ring 321. The reverse surfaces of the ratchet 331 and the clutch ratchet ring 321, which are perpendicular to each other, prevent the ratchet from rotating freely in reverse. When the knob reverses, when the ratchet 331 separates from the clutch ratchet ring 321, the restriction effect of the clutch ratchet ring 321 on the ratchet 331 disappears, and the energy accumulated by the torsion spring 34 can actively drive the clutch cylinder 22 and the ratchet 33 to reverse synchronously to reduce the energy. When the clutch cylinder 22 rotates, it will also drive the memory element 28 to move downward along the small push rod 23.

[0038] Pressing the release button 21 moves it downwards along the guide rod 211, separating the anti-disengagement latch between the guide rod 211 and the clutch cylinder 22. After the lower end face of the release button 21 contacts the upper end face of the clutch cylinder 22, it can push the clutch cylinder 22 to be positioned in the axial position of the second clutch cylinder. The upper end of the clutch cylinder 22 separates from the jumping tooth 33, and the lower end of the clutch cylinder 22 is connected to the large push rod 27. The second drive ratchet and the second drive ratchet mesh. At this time, the stored force of the torsion spring 24 is released, causing the clutch cylinder 22 to rotate counterclockwise. The clutch cylinder is now connected to the large push rod 27, causing the large push rod 27 to rotate counterclockwise. The rib groove in the large push rod 27 causes the small push rod 23 to move counterclockwise spiral downwards, transmitting the force to the push handle 25, pushing the rubber stopper downwards for injection, and then pushing out the squeezing bottle to inject the medicine. When the small push rod 23 moves counterclockwise spiral downwards, it drives the memory component 28 to reset to the assembly position of the large push rod 27. The moment the memory component 28 contacts the large push rod 27, a "pop" sound can be emitted to indicate that the injection is complete.

[0039] After injection, release button 21. Due to the action of release spring 26, the anti-disengagement latches between guide rod 211 and clutch cylinder 22 engage, causing clutch cylinder 22 to return to its original axial position. Except for small push rod 23, which remains in the post-injection state at push rod drive component 25, all other components return to their dosage setting state. Repeat this dosage setting and injection process multiple times until small push rod 23 reaches its end and locks against memory component 28, preventing further injection. This completes the injection of the entire vial of medication, at which point knob 31 can no longer be rotated.

[0040] Furthermore, the dosage setting component also includes a graduated cylinder 34. The inner wall of the graduated cylinder 34 is slidably connected to the outer wall of the clutch cylinder 22. The outer wall of the graduated cylinder 34 is provided with a spiral slide rail. The inner wall of the upper pen body 11 is provided with a locking block that cooperates with the slide rail. The outer wall of the graduated cylinder 34 and the inner wall of the upper pen body are spirally slidably connected. In this way, when the clutch cylinder 22 drives the graduated cylinder 34 to rotate synchronously, the graduated cylinder 34 rotates and moves up and down continuously under the synchronous action of the outer and inner walls. With the help of the viewing window on the upper pen body 11, the set injection volume can be accurately determined. The inner wall of the graduated cylinder 34 and the outer wall of the clutch cylinder 22 are provided with several mutually cooperating guide rails and sliders. The guide rails and sliders are evenly distributed circumferentially on the inner wall of the graduated cylinder 34 and the outer wall of the clutch cylinder 22. The upper and lower ends of the outer wall of the clutch cylinder 22 are respectively provided with a zero-position limiting rib and a termination limiting rib that cooperate with the graduated cylinder 34.

[0041] Furthermore, the lower end of the large push rod 27 is provided with a flexible ratchet arm 274, and the first driving ratchet 271 is disposed on the outer end face of the flexible ratchet arm 274. The first driving ratchet 271 is provided with a stop surface so that the large push rod can only rotate in one direction (counterclockwise) relative to the push rod drive member 25. In this way, when the first driving ratchet 252 and the first driving ratchet 271 mesh and rotate, the flexible ratchet arm 274 jumps continuously on the ratchet surface, which will emit a "click-click" injection reminder sound.

[0042] Furthermore, the pen cap is also equipped with a pen clip for easy carrying.

[0043] The torsion spring auto-injector of this embodiment has a simple structure, is easy to manufacture and install, and is easy to operate and carry. Its overall structure is compact and scientifically designed, and its operation is smooth. Using a torsion spring as the driving force for injection improves the convenience and comfort of medication administration, enabling a fast and stable injection process, making it suitable for widespread application. Its dosage setting component uses a knob, clutch teeth, and a jumping tooth. The desired dosage is adjusted by rotating the knob in both forward and reverse directions. Because the elasticity of the torsion spring is stable and controllable, the dosage adjustment mechanism can achieve high-precision dosage setting, thus ensuring the accuracy of the injection dose. Furthermore, the elastic characteristics of the torsion spring make the injection pen more stable during use, reducing injection deviation caused by external force interference. The elastic characteristics of the torsion spring also allow the dosage adjustment mechanism to automatically reset after use, improving the reliability and service life of the injection pen. During forward and reverse rotation, the jumping tooth and clutch teeth will emit a prompt sound, facilitating user operation. The syringe uses an internal gear clutch for its injection components, including the clutch cylinder, large push rod, and push rod drive. When not released, the clutch cylinder and large push rod are not engaged, which does not affect the screwing operation when setting the dosage. The combination of the large push rod, memory device, and push rod drive allows the syringe to inject multiple times to complete the injection of the entire bottle of medicine. It can also emit a prompt sound during the injection process for user convenience.

[0044] This embodiment also discloses a jumping tooth structure, such as Figure 5As shown, the device includes a toothed body, which is tubular in shape. The inner diameter of the upper end of the inner wall of the toothed body is smaller than that of the lower end. The upper end of the inner wall of the toothed body is used for a connecting part to the drive component. The lower end of the toothed body has a hollowed-out portion, at which a circular spring arm 333 is provided. This spring arm 333 rotates around the center and is inclined downwards. The lower end of the spring arm 333 has a jumping ratchet 331. The connections between the upper and lower ends of the spring arm 333 and the toothed body and jumping ratchet 331 are all arc-shaped transitions. This prevents the connection of the spring arm 333 from breaking due to excessive stress, resulting in good fatigue resistance and service life. This one-way ratchet uses an inclined downward-facing spring arm and jumping ratchet structure, which can be molded from plastic material using an injection molding process, making it convenient for production and assembly. The spring arm 333 is usually elongated or arc-shaped, possessing a certain degree of elasticity and flexibility, and can be bent or deformed to adapt to different usage requirements. This design allows the spring arm 333 to deform when subjected to external force, thereby playing a role in buffering, fixing or adjusting.

[0045] The above description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. All simple equivalent changes and modifications made in accordance with the scope of the present utility model patent application and the description of the utility model shall still fall within the scope of the present utility model patent.

Claims

1. A dosage adjustment sound-generating structure, including a clutch tooth, a jumping tooth, and a knob, characterized in that, The ratchet is positioned above the clutch tooth and is fitted inside the knob. The ratchet and the knob are respectively provided with a first component and a second component that cooperate with each other. The ratchet also has a spring arm, the lower end of which extends beyond the lower end face of the ratchet and has a ratchet tooth. The upper end face of the clutch tooth has a clutch ratchet ring that cooperates with the ratchet tooth. The side wall of the knob also has an adjusting protrusion positioned below the spring arm. When the knob rotates clockwise, the first and second components cooperate to allow the knob and the ratchet to rotate synchronously, and the ratchet tooth slides on the clutch ratchet ring to adjust the dosage. When the knob rotates counterclockwise, the adjusting protrusion engages the spring arm, causing the ratchet tooth to separate from the clutch ratchet ring.

2. The dose setting sound producing structure of claim 1, wherein, Both the ratchet and the clutch ratchet ring have a beveled surface on the forward rotation side and a vertical surface on the reverse rotation side.

3. A dose setting sound producing structure according to claim 1 or 2, wherein The clutch tooth is provided with a first positioning block and a second positioning block. The left and right sides of the first positioning block are provided with radial positioning parts that restrict the radial rotation of the clutch tooth. The bottom of the first positioning block is provided with a first axial positioning part that restricts the axial movement of the clutch tooth. The bottom of the second positioning block is provided with an inclined mounting part. The upper end surface of the second positioning block is provided with a second axial positioning part that restricts the axial movement of the clutch tooth.

4. The dose setting clicker of claim 1, wherein, The outer surface of the knob is provided with several raised and recessed textures.

5. The dose setting sound producing structure of claim 1, wherein, The jumping teeth are provided with a connecting ratchet or a connecting keyway.

6. The dose setting sound producing structure of claim 1, wherein, The jumping tooth and the knob are respectively provided with a rotating slot and a rotating block that cooperate with each other. The lower end face of the jumping tooth corresponding to the rotating slot is inclined, and the upper end face of the rotating block is also inclined.

7. The dose setting sound producing structure of claim 1, wherein, The upper end face of the adjusting protrusion is arc-shaped to match the lower end face of the spring arm.

8. A torsion spring auto-injector, characterised in that, The device includes a pen body, on which a medicine bottle, an injection component, and a dosage adjustment and sound-emitting structure as described in any one of claims 1-7 are mounted. The injection component includes a release button, a clutch cylinder, a small push rod, a release spring, a torsion spring, and a push rod drive component. The clutch teeth are fixedly mounted on the upper end of the pen body. A knob is rotatably mounted on the upper end of the pen body. The release button is mounted on the upper end of the clutch cylinder. The release spring is disposed inside the knob, and its two ends respectively abut against the release button and the pen body. The release spring positions the clutch cylinder at a certain position. The clutch cylinder is positioned in the first axial position during dosage setting. The upper end of the clutch cylinder is connected to the jumping tooth and can rotate synchronously with the jumping tooth and the torsion spring. Pressing the release button can push the clutch cylinder to be positioned in the second axial position. The upper end of the clutch cylinder separates from the jumping tooth and releases the torsion spring, causing the clutch cylinder to rotate. When the clutch cylinder rotates, it drives the small push rod to rotate. The push rod drive converts the rotational torque of the small push rod into axial thrust, thereby pushing out the squeezing vial to inject the medicine.

9. The torsion spring automatic injector of claim 8, wherein, The injection component also includes a large push rod, a push rod drive unit installed inside the pen body, and a positioning block or positioning groove on the side wall of the push rod drive unit that cooperates with the pen body to prevent the push rod drive unit from rotating and facilitates installation. The push rod drive unit has a first drive ratchet, and the lower end of the large push rod has a first drive ratchet tooth that cooperates with the first drive ratchet. The small push rod has an external drive thread, and the push rod drive unit has an internal drive thread that cooperates with the small push rod. The push rod drive unit and the small push rod are threadedly connected. The lower end of the small push rod passes through the large push rod and the push rod drive unit and is connected to a push handle and a rubber stopper for facilitating the squeezing of the medicine bottle. The large push rod has a positioning block or positioning groove that cooperates with the pen body. The small push rod has a groove, the large push rod has a second drive ratchet, and the lower end of the clutch cylinder has a second drive ratchet. When setting the dosage, the clutch cylinder is positioned in the axial position of the first clutch cylinder, and there is a gap between the lower end of the clutch cylinder and the large push rod. During injection, the clutch cylinder is positioned in the axial position of the second clutch cylinder, and the lower end of the clutch cylinder is connected to the large push rod. The second drive ratchet and the second drive ratchet mesh, the stored force of the torsion spring is released, and the clutch cylinder is rotated counterclockwise. At this time, the clutch cylinder is connected to the large push rod, which in turn rotates counterclockwise. The groove inside the large push rod drives the small push rod to move counterclockwise spiral downward, transmitting the force to the push handle and pushing the rubber stopper downward for injection.

10. A jumping tooth, characterized by It includes a tooth body, on which a spring arm is provided. The spring arm is inclined downward and the lower end of the spring arm is provided with a ratcheting tooth.

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